Spike structure made of different materials and featuring augmented joining strength

Abstract

A spike structure made of different materials and featuring augmented joining strength includes: a sole protruding component including a joining ring portion, first and second joining portions disposed at two ends of the joining ring portion respectively; an interface component including a middle portion disposed in the joining ring portion, first and second receding portions disposed at two ends of the middle portion and joined to the first and second joining portions respectively, with the first and second receding portions being of a smaller thickness than the middle portion and thus receding toward each other so as to clamp and join to the sole protruding component; and a spike component joined to the first receding portion. Owing to the structural design and material contraction of the interface component upon injection, the interface component and spike component are firmly adhered together to enhance structural strength and stability of the spike.

What is claimed is: 
     
         1 . A spike structure comprising:
 a sole protruding component made of polypropylene (PP) and comprising a joining ring portion, a first joining portion disposed at an end of the joining ring portion, and a second joining portion disposed at another end of the joining ring portion;   an interface component comprising:
 a middle portion disposed in the joining ring portion, 
 a first receding portion disposed at an end of the middle portion, extended outward, and joined to the first joining portion, wherein the first receding portion is exposed to an external environment, and 
 a second receding portion disposed at another end of the middle portion, extended outward, and joined to the second joining portion, wherein the second receding portion has an uppermost surface that is flush with an uppermost surface of the sole protruding component, 
 wherein the first receding portion and the second receding portion each have a respective thickness that is less than a thickness of the middle portion and recede toward each other, wherein the first receding portion and the second receding portion are clamped and joined to the sole protruding component; and 
   a spike component made of thermoplastic polyurethane (TPU), wherein the spike component is joined to the first receding portion and exposed from the sole protruding component, wherein the spike component is entirely vertically beneath the interface component.   
     
     
         2 . The spike structure according to  claim 1 , wherein the first receding portion of the interface component is shaped to match the first joining portion of the sole protruding component, and the second receding portion of the interface component is shaped to match the second joining portion of the sole protruding component. 
     
     
         3 . The spike structure according to  claim 1 , wherein the first joining portion of the sole protruding component has a joining bump, the first receding portion of the interface component has a receding sunken portion enclosing the joining bump, the second joining portion of the sole protruding component has a joining sunken portion, and the second receding portion of the interface component has a receding raised portion embedded in the joining sunken portion. 
     
     
         4 . The spike structure according to  claim 1 , wherein the joining ring portion has a joining inner annular surface, the first joining portion has a first joining surface, the second joining portion has a second joining surface, the middle portion has a middle outer annular surface pressing against the joining inner annular surface and a middle inner annular surface facing away from the middle outer annular surface, the first receding portion has a first receding inner surface pressing against the first joining surface and a first receding outer surface facing away from the first receding inner surface, and the second receding portion has a second receding inner surface pressing against the second joining surface and a second receding outer surface facing away from the second receding inner surface, defining a shortest distance between the first receding inner surface and the first receding outer surface as the thickness of the first receding portion, defining a shortest distance between the second receding inner surface and the second receding outer surface as the thickness of the second receding portion, and defining a shortest distance between the middle outer annular surface and the middle inner annular surface as the thickness of the middle portion. 
     
     
         5 . The spike structure according to  claim 1 , wherein the thickness of the second receding portion increases toward the middle portion. 
     
     
         6 . The spike structure according to  claim 1 , wherein the first receding portion of the interface component has a joining concave portion sinking toward the middle portion, and the spike component has a joining convex portion joined to the joining concave portion. 
     
     
         7 . The spike structure according to  claim 1 , wherein the interface component is made of one of polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), thermoplastic polyurethane (TPU) of Shore D hardness ranging from 55 to 75, a mixture of acrylonitrile-butadiene-styrene copolymer (ABS) and thermoplastic polyurethane (TPU), a mixture of thermoplastic polyurethane (TPU) and glass fiber (GF), a mixture of polycarbonate (PC) and acrylonitrile-butadiene-styrene copolymer (ABS), polyether block amide, and a mixture of polyether block amide and glass fiber (GF).